diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 39bef94..2ba2bf2 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -37,6 +37,7 @@ export * from './randomString'
 export * from './retry'
 export * from './sleep'
 export * from './sort'
+export * from './stringFormatter'
 export * from './union'
 export * from './unique'
 export * from './uniqueWith'
diff --git a/packages/core/src/stringFormatter.test.ts b/packages/core/src/stringFormatter.test.ts
new file mode 100644
index 0000000..fce22b6
--- /dev/null
+++ b/packages/core/src/stringFormatter.test.ts
@@ -0,0 +1,16 @@
+import { describe, expect, it } from 'vitest'
+
+import { formatterBankCard } from './stringFormatter'
+
+describe('stringFormatter', () => {
+  it('formatterBankCard', () => {
+    expect(formatterBankCard('1234567890123456')).toMatchInlineSnapshot(`"1234 5678 9012 3456"`)
+    expect(formatterBankCard('   1234  56  7890  23456')).toMatchInlineSnapshot(`"1234 5678 9023 456"`)
+    expect(formatterBankCard('_  3232 32432 32432  ')).toMatchInlineSnapshot(`"3232 3243 2324 32"`)
+    expect(formatterBankCard('_  Sdj 32 32432 jds3232ds  ')).toMatchInlineSnapshot(`"3232 4323 232"`)
+    expect(formatterBankCard('')).toMatchInlineSnapshot(`""`)
+    expect(formatterBankCard('null')).toMatchInlineSnapshot(`""`)
+    // @ts-expect-error test undefined
+    expect(formatterBankCard(undefined)).toMatchInlineSnapshot(`""`)
+  })
+})
diff --git a/packages/core/src/stringFormatter.ts b/packages/core/src/stringFormatter.ts
new file mode 100644
index 0000000..1236ce0
--- /dev/null
+++ b/packages/core/src/stringFormatter.ts
@@ -0,0 +1,8 @@
+/**
+ * Formats a bank card number by removing non-digit characters and adding spaces every four digits.
+ * @param str - The bank card number to be formatted.
+ * @returns The formatted bank card number.
+ */
+export function formatterBankCard(str: string) {
+  return `${str}`.replace(/\D/g, '').replace(/(\d{4})(?=\d)/g, '$1 ')
+}