Please create the following functions in python and explain each step :)

e) Write a function that takes in a string and returns a string built from every even index from the original string (first, third, fifth, seventh, etc.) f) Write a function that takes in a string and returns a copy of the original string with all the repeated characters removed g) Write a function that takes in a string and returns a string that only contains the characters that were repeated in the entered string (e.g., Input: 112355fjshfsdaslhlsfnmbsdjkgf, output: 15fjshdl)

f) Write a function that takes in a string and returns a copy of the original string with all the repeated characters removed

g) Write a function that takes in a string and returns a string that only contains the characters that were repeated in the entered string (e.g., Input: 112355fjshfsdaslhlsfnmbsdjkgf, output: 15fjshdl)