fix: 删除mm 文件编译报错的方法.

Runtime/GuruConsent/Plugins/iOS/U3DConsent.mm

@@ -94,15 +94,6 @@ static NSString *callbackName;
     }];
 }
 
-// 字符串转换
-+(char*) stringToChar: (NSString *) str
-{
-    const char *cString = [str cStringUsingEncoding:NSASCIIStringEncoding];
-    char cPtr[str.length * 3 + 1];
-    memset(cPtr, 0, sizeof(cPtr));
-    return [str getCString:cPtr maxLength:sizeof(cPtr) encoding: NSUTF8StringEncoding];
-}
-
 
 +(char*) finalChar: (NSString *) string
 {