String functions Case fixed

fixed concat, match, split, join functions

Author: AmritDevkota

README.md

@@ -242,11 +242,11 @@ Javascript provide many functions to operate on string, like indexOf(), split(),
 |Function   | Description               |
 |-----------|---------------------------|
 |charAt()   |It is useful to find a specific character present in a string.|
-|Concat()   |It is useful to concat more than one string.|
+|concat()   |It is useful to concat more than one string.|
 |indexOf()  |It is useful to get the index of a specified character or a part of the string.|
-|Match()    |It is useful to match multiple strings.|
-|Split()    |It is useful to split the string and return an array of string.|
-|Join()     |It is useful to join the array of strings and those are separated by comma (,) operator.|
+|match()    |It is useful to match multiple strings.|
+|split()    |It is useful to split the string and return an array of string.|
+|join()     |It is useful to join the array of strings and those are separated by comma (,) operator.|
 
 **Example:**