Create an EA based on EMA´s crossover

Using three sets of EMA´s, let´s say EMA (A), EMA (B) and EMA (C), this strategy gets a buy signal whenever EMA(C) is above EMA (B) and both are above EMA (A)

IF EMA (C) is above EMA(B), then another trade is opened

The opposite goes for the sell signal, EMA (C) is below EMA (B) and both are below EMA(A)

Also, if both EMAs (C) and (B) are below (A) but EMA  (C) is above (B) , trade should close or not opened

IF EMA (C) is below EMA(B), then another trade is opened

EMA (B) is composed by two EMA