Nsmutablestring modifiable string-objective-C

Nsmutablestring common methods for modifying strings

+ (ID) stringwithcapacity: Size	Create a string with the size
-(ID) initwithcapacity: Size	Initializes a string with the size
-(Void) setstring: nsstring	Set the string to nsstring
-(Void) appendstring: nsstring	Append the string nsstring to the end of the string
-(Void) deletecharatersinrange: Range	Delete characters in a specified range
-(Void) insertstring: nsstring atindex: I	Insert nsstring at the starting position of index I
-(Void) replacecharatersinrange; range withstring: nsstring	Use nsstring to replace the character specified by range
-(Void) replaceoccurrencesofstring: nsstring withstring: nsstring2 options: opts range: Range	Replace all nsstrings with nsstring2 in the specified range according to opts