1) Make a function that converts lbs to kg.
Hint:  1 kg is 2.2 lbs
convert2kg(10) should be 4.5
convert2kg(2) should be 0.9


2) Make a function that can convert from  lbs to kg or the other way.
If the second arg is a 1, convert lbs -> kg.
If the second arg is a 2, convert kg -> lbs.
convert(10, 1) should be 4.5
convert(10, 2) should be 22


3) Make a function that can convert from  lbs to kg or the other way.
If the second arg is a 1, convert lbs -> kg.
If the second arg is a 2, convert kg -> lbs.
If there is no second arg, convert lbs -> kg.
convert(10, 1) should be 4.5
convert(10, 2) should be 22
convert(10) should be 4.5


4) Make a function that makes a list of ints, from 1 .. N
makeList(3) should yield [1,2,3]
makeList(10) should yield [1,2,3,4,5,6,7,8,10]
makeList(0) should yield []
makelist(-10) should yield []

5) Make a function that searches for the second arg in the list that is
the first arg.  Return True/False if found or not.
findIt([1,2,3,4,3,2,1], 99) should be False
findIt([1,2,3,4,3,2,1], 4) should be True
findIt(['a', 'b', 'c'], 'a') should be True
findIt(['a', 'b', 'c'], 'x') should be False


6) An email address should have an @ sign.
isEmail("fred@wilma.com") should be True
isEmail("123 Fourth St") should be False

7) An email address should be at least 5 characters long, and contain
an @ sign.
Hint: len("abc") is 3 and len("abcdef") is 5
Hint:  if "@" in "fred@wilma.com":
isEmail2("fred@wilma.com") should be True
isEmail2("a@b") should be False

8) An Email address should have a @ sign and should have a "."
isEmail3("fred@wilma_com") should be False
isEmail3("fred@wilma.com") should be True

9) this function returns the LOCATION of the @ sign.
whereIs("ab@cdef") returns 2
whereIs("abcd@efg") returns 4
whereis("abc") returns -1 (because there is no @ sign