Programming in Go:

Write a Smash function takes the following inputs: io.Reader4 to read text data, and a smasher function that returns a uint32 given a word. smasher may return the same output uint32 value for dierent input words. The output of Smash is a map[uint32]uint that stores the count of the number of words that are mapped to the same value by smasher. Words in a string are separated by whitespace and newline. As an example, suppose smasher maps a word to its length. Then for the input a c d ab abc bac abcd dcba, Smash will return the map {1: 3, 2: 1, 3: 2, 4: 2}. On the other hand, if the given smasher were to map each word to unique output, then Smash would return the count of each word in the input io.Reader.