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# Task 2: Reverse Prefix
# Submitted by: Mohammad Sajid Anwar
#
# You are given a string, $str and a character in the given string, $char.
# Write a script to reverse the prefix upto the first occurrence of the given $char in the given string $str and return the new string.
#
# Example 1
# Input: $str = "programming", $char = "g"
# Output: "gorpmming"
#
# Reverse of prefix "prog" is "gorp".
#
# Example 2
# Input: $str = "hello", $char = "h"
# Output: "hello"
#
# Example 3
# Input: $str = "abcdefghij", $char = "h"
# Output: "hgfedcbaj"
#
# Example 4
# Input: $str = "reverse", $char = "s"
# Output: "srevere"
#
# Example 5
# Input: $str = "perl", $char = "r"
# Output: "repl"
def reverse_prefix(str, char):
strings = list(str)
new_str = ''
for n in (range(len(str))):
letter = strings.pop(0);
new_str += letter
if letter == char:
new_str = new_str[::-1]
break
new_str += ''.join( strings )
print("'%s' '%s' -> '%s'" % (str, char, new_str) )
if __name__ == "__main__":
str = "programming"
char = "g"
reverse_prefix( str, char )
str = "hello"
char = "h"
reverse_prefix( str, char )
str = "abcdefghij"
char = "h"
reverse_prefix( str, char )
str = "reverse"
char = "s"
reverse_prefix( str, char )
str = "perl"
char = "r"
reverse_prefix( str, char )
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