feat: user helper class

brints-estate-api/src/utils/userHelper.lib.ts

@@ -0,0 +1,18 @@
+export class UserHelper {
+  constructor() {}
+
+  public capitalizeFirstLetter(name: string): string {
+    return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
+  }
+
+  public validateCountryCode(countryCode: string): boolean {
+    return countryCode.startsWith('+');
+  }
+
+  public formatPhoneNumber(countryCode: string, phoneNumber: string): string {
+    if (phoneNumber.startsWith('0')) {
+      phoneNumber = phoneNumber.slice(1);
+    }
+    return `${countryCode}${phoneNumber}`;
+  }
+}