Utils: capitalize cannot convert space to null

@@ -518,17 +518,16 @@ class GetUtils {
   /// Capitalize each word inside string
   /// Example: your name => Your Name, your name => Your name
   static String capitalize(String value) {
-    if (isNullOrBlank(value)) return null;
+    if (isNull(value)) return null;
+    if (isBlank(value)) return value;
     return value.split(' ').map(capitalizeFirst).join(' ');
   }
 
   /// Uppercase first letter inside string and let the others lowercase
   /// Example: your name => Your name
   static String capitalizeFirst(String s) {
-    if (isNullOrBlank(s)) {
-      return null;
-    }
-
+    if (isNull(s)) return null;
+    if (isBlank(s)) return s;
     return s[0].toUpperCase() + s.substring(1).toLowerCase();
   }