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        <link:linkbaseRef xlink:type="simple" xlink:href="cirx-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="cirx-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="cirx-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Calculation Links" />
        <link:linkbaseRef xlink:type="simple" xlink:href="cirx-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links" />
      </appinfo>
    </annotation>
    <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
    <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
    <import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd" />
    <import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd" />
    <import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd" />
    <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
    <import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd" />
    <import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd" />
    <import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd" />
    <element id="CIRX_OneCustomerMember" name="OneCustomerMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ProductDevelopmentServiceAgreementsMember" name="ProductDevelopmentServiceAgreementsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ProductDeliveryToCustomersMember" name="ProductDeliveryToCustomersMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_DigitalMultiMediaTechnologyMember" name="DigitalMultiMediaTechnologyMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_FurnitureAndOfficeEquipmentMember" name="FurnitureAndOfficeEquipmentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_PromissoryNotesMember" name="PromissoryNotesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_FamilyMemberOfPresidentMember" name="FamilyMemberOfPresidentMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ShareholderTwoMember" name="ShareholderTwoMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_IehabHawatmehMember" name="IehabHawatmehMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_EmploymentAgreementMember" name="EmploymentAgreementMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_NotesPayableMember" name="NotesPayableMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebtOneMember" name="ConvertibleDebtOneMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebtTwoMember" name="ConvertibleDebtTwoMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebtThreeMember" name="ConvertibleDebtThreeMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebtFourMember" name="ConvertibleDebtFourMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebtFiveMember" name="ConvertibleDebtFiveMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ConvertibleDebenturesMember" name="ConvertibleDebenturesMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_TobaccoLineMember" name="TobaccoLineMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_AllOtherProductLineMember" name="AllOtherProductLineMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_LiabilitiesForProductReturnsAndCreditsCurrent" name="LiabilitiesForProductReturnsAndCreditsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_IncomeLossFromDiscontinuedOperations" name="IncomeLossFromDiscontinuedOperations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_IncreaseDecreaseInDepositsOnInventoryRelatedParty" name="IncreaseDecreaseInDepositsOnInventoryRelatedParty" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_IncreaseDecreaseInLiabilitiesForProductReturns" name="IncreaseDecreaseInLiabilitiesForProductReturns" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_IncreaseDecreaseInShorttermAdvancesPayable" name="IncreaseDecreaseInShorttermAdvancesPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ScheduleOfAccruedPayrollAndCompensationLiabilitiesTableTextBlock" name="ScheduleOfAccruedPayrollAndCompensationLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ScheduleOfActivityOfDerivativeLiabilityTableTextBlock" name="ScheduleOfActivityOfDerivativeLiabilityTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_StockPercentage" name="StockPercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_WorkingCapitalDeficiency" name="WorkingCapitalDeficiency" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_InventoryPercentage" name="InventoryPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_AccruedDirectorFeesCurrent" name="AccruedDirectorFeesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_AccruedAdministrativePayrollCurrent" name="AccruedAdministrativePayrollCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_QuarterlyBonusPercentageOfEarningsBeforeInterestTaxesDepreciationAndAmortization" name="QuarterlyBonusPercentageOfEarningsBeforeInterestTaxesDepreciationAndAmortization" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_NotesPayabletToFormerServiceProvider" name="NotesPayabletToFormerServiceProvider" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_NotePayableForSettlementOfDebt" name="NotePayableForSettlementOfDebt" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_SmallBusinessAdministrationLoan" name="SmallBusinessAdministrationLoan" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_DerivativeLiabilityRemainingLife" name="DerivativeLiabilityRemainingLife" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_DisposalGroupIncludingDiscontinuedOperationInterestPayable" name="DisposalGroupIncludingDiscontinuedOperationInterestPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_DisposalGroupIncludingDiscontinuedOperationAccruedPayrollAndCompensationExpense" name="DisposalGroupIncludingDiscontinuedOperationAccruedPayrollAndCompensationExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_CurrentMaturitiesOfLongtermDebtOfDisposalGroupIncludingDiscontinuedOperation" name="CurrentMaturitiesOfLongtermDebtOfDisposalGroupIncludingDiscontinuedOperation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ShorttermAdvancesPayableOfDisposalGroupIncludingDiscontinuedOperation" name="ShorttermAdvancesPayableOfDisposalGroupIncludingDiscontinuedOperation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_DisposalGroupIncludingDiscontinuedOperationGainOnWriteOffOfTimeBarredDebt" name="DisposalGroupIncludingDiscontinuedOperationGainOnWriteOffOfTimeBarredDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="CIRX_ScheduleOfActivityOfTheDerivativeLiabilityTableTextBlock" name="ScheduleOfActivityOfTheDerivativeLiabilityTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
</schema>
