Write a function named contains-double in Scheme that takes a list as input and returns true if an item every appears twice in a row. You may assume the list is flat (i.e., no nested lists). For example, • (contains-double • (contains-double • (contains-double (contains-double ● (contains-double '(a b c 1 2)) should return false '(a b c 1 a)) should return false '(a b b c 1 a)) should return true '()) should return false '(5)) should return false

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.